Current knowledge allows us to characterize the Castelli Romani as a seismic area. medium-low than in the past ? been hit by earthquakes sometimes capable of causing moderate damage to buildings. This condition? well photographed in the Map of Hazard? Seismic by INGV (http://zonesismiche.mi.ingv.it/) and in the new seismic classification of the Lazio region developed by ENEA on behalf of the Lazio Region (http://www.regione.lazio.it/web2/ contents/environment/topic.php?vms=5&id=16 ).
In the past, the Castelli Romani area has had numerous seismic swarms, characterized by durations of even many months (such as for example in 1989-90), low depths? hypocentral (between 2 and 7 km) and aftershocks of magnitude generally lower than 4 (Mercalli intensity generally lower than VI degree). Some ancient seismic events had an (estimated) magnitude of around 5 and caused damage in some towns in the Colli Albani region, such as in 1806, 1829, 1899 and 1927.
The activity? seismic current does not have differences with that of recent years, as you can? check from the INGV iside database (http://iside.rm.ingv.it).
Read more on seismicity? of the Alban Hills:
DBMI04: the Italian macroseismic database (http://emidius.mi.ingv.it/DBMI04/)
CPTI04: The catalog of Italian earthquakes (http://emidius.mi.ingv.it/CPTI04/)
The 1989-1990 seismic swarm in the Alban Hills volcanic area, central Italy,
by Alessandro Amato, Claudio Chiarabba, Massimo Cocco, Massimo di Bona, Giulio Selvaggi,
Journal of Volcanology and Geothermal Research, 61 (1994) 225-237 (in English)
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Rome and the earthquakes: http://www.youtube.com/ingvterremoti#p/u/2/HzOqBrUtFyY